There is a single, well-defined encounter with the Sagittarius arm a little over 10 Myr ago. The 23 M\(_{\odot }\)  secondary [1]}, [2]} has an estimated ZAMS lifetime of 12.8 Myr, which is perfectly compatible with this spiral arm being the birthplace of 2FGL J1019.0-5856. We do not find any encounter with stellar clusters from Gaia.
